@function grid-width($n) {
  @return +($n - 1) * $gutter-width;
}

@function grid-width () {
  $color: red;
  @return $color;
}

@function grid-width ($a) {
  @function grid-height($b) {
    @return $color;
  }
  @return $world;
}

$helvetica: map.deep-merge($helvetica-light, $helvetica-heavy);